EP3143123A1 - Microrna induction of cardiac regeneration - Google Patents
Microrna induction of cardiac regenerationInfo
- Publication number
- EP3143123A1 EP3143123A1 EP15792355.8A EP15792355A EP3143123A1 EP 3143123 A1 EP3143123 A1 EP 3143123A1 EP 15792355 A EP15792355 A EP 15792355A EP 3143123 A1 EP3143123 A1 EP 3143123A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- mir
- mir302
- cluster
- vector
- mimic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Definitions
- the invention relates to compostions and methods for promoting cellular proliferation and de-differentiation of cells into stem cells to foster tissue regeneration. Specifically, the invention relates to transiently administering a microRNA (miR) or its mimic for promoting cardiomyocyte proliferation and cardiac regeneration.
- miR microRNA
- Such disassembly may require signals for cardiomyocyte de- differentiation, which is accompanied by multiple cellular changes including reactivation of gene expression programs restricted to the embryonic state.
- signals for cardiomyocyte de- differentiation which is accompanied by multiple cellular changes including reactivation of gene expression programs restricted to the embryonic state.
- approaches that reactivate or increase postnatal cardiomyocyte proliferation could have a positive affect on cardiac repair and regeneration but their persistence would need to be carefully tuned to avoid cardiomyocyte dysfunction associated with a highly proliferative, de-differentiated state.
- MicroRNAs can have potent affects on gene expression and can alter cell phenotype by coordinately targeting multiple components in important cellular pathways.
- miR cluster or families are expressed in early development and play important roles in maintaining tissue specific progenitor identity.
- miR302-367 is expressed during early embryogenesis in embryonic stem cells and in the developing lung endoderm where it promotes a de-differentiated phenotype characterized by high levels of cell proliferation.
- a composition comprising a microRNA (miR) 302-367 cluster or a miR 302-367 cluster mimic.
- the transient contact is sufficient to transiently activate cardiomyocyte proliferation, but not to reactivate the cell cycle of postnatal cardiomyocytes.
- RNA miR
- a composition comprising a microRNA (miR) 302-367 cluster or a miR 302-367 cluster mimic.
- RNA miR
- methods for promoting cardiomyocyte proliferation in a subject comprising: transiently administering to said subject a composition comprising a microRNA (miR) 302-367 cluster or a miR 302-367 cluster mimic.
- a composition comprising a microRNA (miR) 302-367 cluster or a miR 302-367 cluster mimic.
- kits for treating a cardiac disease or disorder in a subject comprising: transiently administering to said subject a composition comprising a microRNA (miR) 302-367 cluster or a miR 302-367 cluster mimic.
- a composition comprising a microRNA (miR) 302-367 cluster or a miR 302-367 cluster mimic.
- FIG. 1 miR302-367 is expressed in the early heart and is important for cardiomyocyte proliferation.
- A Relative expression of miR302-367 cluster members during heart development as determined by qRT-PCR.
- B Hematoxylin and eosin (H&E)-stained and immunostained sections of control El 4.5 hearts showing thinning of ventricular wall, hypoplastic ventricular septum, and reduced cardiomyocyte proliferation in Nkx2.5 cre :miR302-367 flox flox mutants compared with miR302-367 flox flox mice.
- RV right ventricle
- LV left ventricle
- VS ventricular septum
- RA right atrium.
- FIG. 1 Over-expression of miR302-367 cluster in developing heart results in increased cardiomyocyte proliferation and cardiomegaly.
- A Nkx2.5 cre : R26R-miR302- 367 Tg + mutants have an enlarged heart with thickened ventricular myocardium and ventricular septal defects compared to Nkx2.5 cre controls
- B Cardiomegaly and increased cardiomyocyte proliferation in Nkx2.5 cre :R26R-miR302-367 Tg + mutant hearts at P20.
- FIG. 3 miR302-367 over-expression leads to increased cell proliferation as well as altered differentiation and metabolism in cardiomyocytes.
- A Wheat germ agglutinin and a- actinin staining of hearts at P20. Cell surface area was quantified at E18.5 and P20. Quantitative analyses represent counting of five fields from three independent samples per group.
- B Heatmap and pathways profile of microarray analysis of Nkx2.5 cre andNkx2.5 cre :R26R-miR302-367 Tg + mutant hearts at P14.
- C and D Gene expression changes related to cell proliferation (C) and programmed cell death (D) at P14.
- FIG. 4 miR302-367 promotes cardiomyocyte proliferation through regulation of Hippo pathway kinases.
- A Expression of Moblb, Lats2, and Mstl in Nkx2.5 cre :R26R- miR302-367 Tg + mutant hearts at E18.5 and Nkx2.5 cre :R26R-miR302-367 flox flox null mutant hearts at E12.5 by qRT-PCR.
- B Luciferase reporter assays showing thatmiR302-367 can repress Mstl, Lats2, and Moblb expression through their respective 3'UTRs. This repression can be reversed by mutations of the miR302-367 binding sites.
- FIG. 5 miR302-367 can promote cardiomyocyte proliferation in the adult heart.
- A Schematic of inducible miR302-367 over-expression in adult heart using Myh6 mercremer mice.
- B to D Confocal images with z-stacking and quantification showing the number of cells reentering the cell cycle [5-bromo-2'-deoxyuridine (BrdU)+] (B), undergoing mitosis (PH3 + ) (C), or undergoing cytokinesis [Aurora B (AuB) + ] (D) 7 days after induction of miR302-367 expression in the adult heart.
- E Number of cardiomyocytes in Myh6 mercremer and Myh6 mercremer :R26R-miR302-367 Tg + animals.
- FACS Fluorescence-activated cell sorting
- FIG. Prolonged miR302-367 overexpression in the adult heart reduces fibrotic scar size but compromises cardiac function after myocardial infarction (MI).
- A Study design of miR302-367 overexpression by tamoxifen intraperitoneal injection after MI by ligation of the left anterior descending (LAD) coronary artery.
- B Masson's trichrome- stained heart sections from the site of ligation toward the apex of control and Myh6 mercremer :R26R-miR302-367 Tg + mice at 21 days after MI. Serial sections were cut at 500-mm intervals from the site of the ligature toward the apex.
- Myh6 mercremer ⁇ ⁇ Myh6 TMmer. R26RmiR302 _ 367 Tg/ + ⁇ ( dad g pgr group).
- C Quantification of the fibrotic regions in heart sections in (B).
- D Immunostaining and quantification ofPH3 + /a-actinin + cells inMyh6 mercremer andMyh6 mercremer :R26R-miR302-367 Tg + hearts at 21 days after MI.
- FIG. 7 Transient miR302 mimic therapy promotes cardiac regeneration and improves function of injured hearts.
- B Masson's trichrome staining of heart sections 50 days after MI and 42 days after final treatment with control or miR302 mimic. Serial sections were cut at 500-mm intervals from the site of the ligature toward the apex. Two representative control and three miR302 mimic-treated hearts are shown.
- C Quantification of the fibrotic areas in heart sections. Data are means + SEM.
- D and E Cardiac function of mice subjected to LAD ligation was evaluated by echocardiography. Data are means + SEM. P values determined by one-way ANOVA.
- FIG. 8 Generation of mice with a conditional deletion of the miR302-367 cluster.
- A In situ hybridization showing the miR302-367 cluster expressed in the developing mouse myocardium at E8.5, E9.5, and E10.5. Arrowheads indicate the miR302-367 cluster in the outflow tract (OFT) of the developing heart. A, atrium; V, ventricle.
- B Schematic representation of the mouse miR302-367 locus and the targeting strategy for deletion of miR302-367.
- C Southern blot analysis of crosses of Nkx2.5 cre :miR302-367 flox + and wild- type mice.
- FIG. 10 Generation of mice with conditional over-expression of the miR302-367 cluster.
- A Schematic of the floxed miR302-367 knock-in allele and the targeting strategy for Cre-activated over-expression of miR302-367.
- B Southern blot analysis of wild-type (11 kb) and R26R-miR302-367 knock-in (3.8 kb) mice after digestion of genomic DNA with EcoRV.
- C qRT-PCR showing specific over-expression of all members of miR302-367 family in Nkx2.5 cre :R26R-miR302-367 Tg + hearts at E18.5.
- FIG. 10 miR302-367 regulates cardiomyocyte proliferation through Hippo pathway.
- A Multiple targets of miR302 were identified by comparing Ago-HITS-CLIP and miRanda predicted targets.
- B Western blot analysis of Mobl, Lats2, Mstl and P-Yap protein level in Nkx2.5 cre :R26R-miR302-367 Tg + hearts at P20.
- C Western blot analysis of Mobl, Lats2, and Mstl in Nkx2.5 cre :R26R-miR302-367 flox flox hearts at E12.5.
- FIG. 11 Gene expression profiles in adult hearts following inducible over- expression of miR302-367.
- A Schematic of induced miR302-367 over-expression in adult heart using Myh6 mercremer mice, and expression levels of all members of the miR302-367 cluster in Myh6 mercremer :R26R-miR302-367 Tg + adult hearts by qRT-PCR two weeks after Cre induction with tamoxifen.
- B Immunostaining and quantification of TUNEL and DAPI in adult hearts two weeks after Cre induction with tamoxifen. Scale bars, 100 ⁇ .
- (D) Differential gene expression in Myh6 mercremer :R26R-miR302-367 Tg + hearts two weeks after Cre induction. Data in (B to D) are means + s.e.m. (n 3). *p ⁇ 0.05 versus Myh6 mercremer control, by Student' s t test.
- FIG. 12 Hippo signaling activity and myocardial features in adult heart following inducible over-expression of miR302-367.
- A Nuclear and phospho-Yap staining in ventricular cardiomyocytes after MI.
- FIG. 13 Half-life of miR302-367 mimic treatment and the effects on cardiomyocyte proliferati n, apoptosis, and vascular perfusion,
- A miR302b/c/367 expression, in the adult bear! at various time points post-mi ' RNA mimic treatment. Numbers on bars indicate the relative expression level of itiiRNA by qRT-PCR.
- B Schematic of mimic treatment experiment and expression of Mst Lais2 ' , and Mob lb in the heart on the final day of miR mimic treatment. Dai ly mimic treatment was chosen due to the relative short half-life of miR ' A mimics in vivo (see A).
- D Schematic of myocardial infarction (Mi) and mimic treatment experiment and qRT-PCR of Hippo signaling components at day 7 post-Mi.
- E Iromunostaining images and quantification for PH3, Tnnt2, and TUNEL at day 7 post-Mi.
- F qRT- PGR analysis showing the transient activation of genes related with cell proliferation, survival, and fetal gene program in miR mimic treated-hearts post-Mi.
- G The vascular plexus was highlighted by Microfil at 9 days post-Mi and after 7 days of miR302b/c mimic treatment.
- FIG. 14 Expression of miR302 mimics in She lung and organ, histology after systemic treatment with mimics.
- A qRT-PCR showing mi.R302b/c/367 levels in She lung at various time points after mlRNA-inimies treatment. Numbers on bars indicate the relative expression level of miRNA.
- B Histology analysis showing the normal morphology in the lung, liver, and intestine in the mice at 6 weeks after miR mimic treatment. Scale bars, 100 ⁇ . images are representative of n - 6 animals.
- the invention relates to compostions and methods for promoting cellular proliferation and de-differentiation of cells into stem cells to foster tissue regeneration. Specifically, the invention relates to transiently administering a microRNA (miR) or its mimic for promoting cardiomyocyte proliferation and cardiac regeneration.
- miR microRNA
- miR302- 367 is expressed in early cardiac development and is important for cardiomyocyte proliferation during embryonic development. Increased miR302-367 expression leads to high level and persistent cardiomyocyte proliferation and ultimately cardiomegaly. miR302-367 functions, in part, by targeting several components of the Hippo signal transduction pathway including Mstl , Lats2, and Moblb.
- Inventors of this application have also surprisingly and unexpectedly found that persistent re-expression of miR302-367 in the postnatal heart reactivates the cardiomyocyte cell cycle and increases cardiomyocyte regeneration but leads to de-differentiation of cardiomyocytes and heart failure.
- temporary application of miR302-367 or its mimics promotes cardiac regeneration without the unwanted affects on cardiac function.
- transient or “temporary application,” as used herein, may refer to application or administration of an miR molecule or its mimic sufficient to transiently activate cardiomyocyte proliferation, but not to reactivate the cell cycle of postnatal cardiomyocytes.
- transient or temporary application may comprise one time single administration of the composition.
- a composition of the invention may include a microRNA (miR) 302-367 cluster, a miR 302-367 cluster mimic, or a combination thereof.
- miR miR
- miR cluster refers to a genetic region or locus that contains a plurality of microRNAs.
- the miR cluster may include a group of adjacent or related genes, which in one embodiment, are co-transcribed in a polycistronic manner.
- the miR genes in a cluster can be transcribed under the control of a single promoter or a plurality of promoters.
- a miR 302-367 cluster includes a single sequence having multiple miRs, all corresponding to the 302-367 locus.
- a microRNA (miR) 302-367 cluster comprises a plurality of miRNAs, including, but not limited to, miR-302a, miR-302a*, miR-302b, miR-302b*, miR- 302c, miR-302c*, miR-302d, miR-367 and miR-367*.
- nucleic acid sequences of miR-302b, miR-302b*, miR-302c, miR-302c*, miR- 302a, miR-302a*, miR-302d, miR-367, and miR-367* are known in the art and described in US2013/0035374 and WO2011/133288, which are incorporated by reference herein in their entirety.
- the nucleic acid sequence of miR-302b is: UAAGUGCUUCCAUGUUUUAGUAG (SEQ ID NO: 1) (miRBase Accession No: MI0000772; ENTREZGENE: 442894); the nucleic acid sequence of miR-302b* is: ACUUUAACAUGGAAGUGCUUUCU (SEQ ID NO: 2) (miRBase Accession No: MIMAT0000714); the nucleic acid sequence of miR-302c is: UAAGUGCUUCCAUGUUUCAGUGG (SEQ ID NO: 3) (miRBase Accession No: MI0000773; ENTREZGENE: 442895); the nucleic acid sequence of miR-302c* is: UUUAACAUGGGGGUACCUGCUG (SEQ ID NO: 4) (miRBase Accession No: MIMAT0000716); the nucleic acid sequence of miR-302a is: UAAGUGGUUCCAUGU
- nucleic acid sequences described herein may include homologous, variant, and functional fragment sequences. Such sequences are known in the art and described in US2013/0035374, WO2011/133288 and WO2009/091659, which are incorporated by reference herein in their entirety. [0034] Nucleic acids described herein may be replaced by functionally equivalent fragments or homologs, which in one embodiment, have at least 50%, 60%, 70%, 80%, 90%, 95%, or 98% sequence homology.
- mir-302a, mir-302b, mir-302c, and mir- 302d genes and RNAs described herein may be replaced with other genes and RNAs with similar functions such as, for example, mir-302a* mir- 302b*, mir-302c*, mir-367, mir-93, mir-371, mir-372, mir-373, mir-520, and the like.
- the miR302-367 cluster for use in the compositions and methods of the present invention is the entire miR302-367 locus.
- the miR302- 367 cluster for use in the compositions and methods of the present invention is the miR302- 367 gene cluster intron.
- the miR302-367 cluster for use in the compositions and methods of the present invention is the first 1234 nucleotides of the miR302-367 gene cluster.
- the miR302-367 cluster for use in the compositions and methods of the present invention is a recombinant gene comprising one or more of miR302b, miR302c, miR302a, miR302d and miR367 linked so as to be transcribed as a single unit.
- the miR302-367 cluster for use in the compositions and methods of the present invention is a recombinant gene comprising one or more of miR302b, miR302c, and miR367 linked so as to be transcribed as a single unit.
- the miR302-367 cluster is a 644 bp fragment of the human miR302-367 region or a 690 bp fragment of the mouse miR302-367 region.
- the miR302-367 cluster is the intronic region between exons 8 and 9 of the Larp7 gene as denoted on the Ensembl database.
- the mir-302 members share an identical (100%) sequence in their 5' first seventeen (17) nucleotides, including the entire seed motif, and an overall 83%-96% homology in their 23- nucleotide mature miRNA sequences.
- the seed motif is located in the first 5' eight nucleotides of a mature miRNA sequence, which determines the binding specificity and efficiency between the miRNA and its target genes.
- the mir-302/367 cluster targets, inter alia, eighteen members of the IGF receptor (IGFR)-Ras/PI3K signaling pathways where insulin- like growth factors (IGF) are potent developmental signals for the differentiation of neuron- specific cell lineage via either the Ras/Raf/mitogen- activated protein kinase (MAPK) or the phosphatidylinositol 3-kinase (PI3K)/Akt signal transduction pathway, which is the same signaling pathways involved in many tumor/cancer transformations, such as brain tumor, breast cancer, lung cancer, prostate cancer, and skin melanoma.
- the compositions and methods of the present invention may be used to suppress tumors or tumor formation.
- the miRNA family is miR290/295 cluster on chromosome 7 in mouse.
- the miRNA family is hsa-miR-372 (MI0000780), hsa-miR- 373 (MI0000781), or hsa-miR-373/373*; hsa-miR-371-373 cluster; hsa-miR-520c (MI0003158), or hsa-miR-520c-5p/520c-3p; mmu-miR-290 (MI0000388), mmu-miR-291a (MI0000389), or mmu-miR-291a-5p/291a-3p; mmu-miR-294 (MI0000392), or mmu-miR- 294/294*; and mmu-miR-295 (MI0000393), or
- a combination of the above -referenced miRs may be used in the compositions and methods described here. This list is not to be construed as limiting, and other miRNA families highly and specifically expressed in embryonic stem cells may be used in the methods described here.
- miRNAs may be used in the compositions and methods described here, either instead of or in addition to miR-302-367: miR106, miR20a/b, miR93, miR17-92 cluster, or a combination thereof.
- a microRNA mimic is used in the compositions and methods described here.
- the miRNA mimic may include a double-stranded oligonucleotide designed to mimic the function of endogenous mature miRNA.
- the miRNA mimic may include one or more chemical modifications that enhances the stability and/or functionality of the duplex.
- the modification may include 2'-0-methyl modification of some or all of the nucleotides of the sense strand and/or minimizes the nuclease sensitivity of the strand and/or enhance the entry of the antisense strand into the RNA interference silencing complex (RISC).
- RISC RNA interference silencing complex
- the mimic can be chemically enhanced to preferentially program RNA-Induced Silencing Complex (RISC) with the active miRNA strand.
- the miRNA mimic may also comprise one or more chemical modifications as described in US2007/0269889, incorporated herein by reference in its entirety.
- Commercially available mimics for example, from Dharmacon or Qiagen, can also be used.
- the mimic is a cholesterol-modified mimic.
- the mimic enables non-viral mediated miRNA expression.
- the mimic is a small and active version of a microRNA.
- the mimic is a non-natural double- stranded miRNA-like RNA fragment, which in one embodiment is designed to have its 5' end bearing a partially complementary motif to the selected sequence in the 3' UTR unique to the target gene. In one embodiment, this RNA fragment can specifically bind its target gene in a gene-specific fashion.
- the mimic is a multi-miRNA mimic, whichis able to silence multiple genes.
- the mimic is a multi- miRNA mimic, as described in Wang, 2009 (Multi-miRNA Hairpins and Multi-miRNA Mimics Technologies in MicroRNA Interference Technologies, Springer Berlin Heidelberg).
- pre-miRNA precursors can be used in the compositions and methods described here.
- the pre-mRNA precursor may act to gain function for the miRNA. Any suitable form of a pre-mRNA precursor can be used.
- one or more mimics or pre-miRNA precursors can be used instead of all in the cluster.
- the miRNA of the compositions and methods described here may be mature miRNA.
- the miRNA may be an miRNA precursor.
- an miRNA precursor is a pre-miRNA, which is subject to cleavage by an RNAse III type double stranded endonuclease called Dicer, resulting in an imperfect miRNA:miRNA* duplex that is around 20-25 nucleotides in size. This duplex contains the mature miRNA strand and its opposite complementary miRNA* strand.
- the present invention provides a composition
- a composition comprising a) an isolated nucleic acid comprising a microRNA (miR) 302-367 cluster or its mimic and b) a histone deacetylase (HDAC) inhibitor.
- the HDAC inhibitor is valproic acid.
- Other suitable HDAC inhibitors are known in the art and can be used.
- An HDAC inhibitor interferes with the function of histone deacetylase to remove acetyl groups from lysine residues leading to the formation of condensed and transcriptionally silenced chromatin.
- an expression vector having an miRNA can be delivered to cells of a subject.
- the nucleic acid molecules are delivered to the cells of a subject in a form in which they can be taken up and are advantageously expressed so that therapeutically effective levels can be achieved.
- Methods for delivery of polynucleotides to a cell include using a delivery system, such as liposomes, polymers, microspheres, gene therapy vectors, and naked DNA vectors.
- a delivery system such as liposomes, polymers, microspheres, gene therapy vectors, and naked DNA vectors.
- Transducing viral (e.g. , retroviral, adenoviral, lenti viral and adeno-associated viral) vectors can be used for somatic cell gene therapy, especially because of their high efficiency of infection and stable integration and expression (see, e.g. , Cayouette et al , Human Gene Therapy 8:423-430, 1997; Kido et al. , Current Eye Research 15:833-844, 1996; Bloomer et al , Journal of Virology 71:6641-6649, 1997; Naldini et al , Science 272:263-267, 1996; and Miyoshi et al , Proc. Natl. Acad. Sci. U.S.A.
- a polynucleotide encoding an miRNA molecule is cloned into a retroviral vector and expression is driven from its endogenous promoter, from the retroviral long terminal repeat, or from a promoter specific for a target cell type of interest.
- viral vectors that can be used include, for example, a vaccinia virus, a bovine papilloma virus, or a herpes virus, such as Epstein-Barr Virus (also see, for example, the vectors of Miller, Human Gene Therapy 15-14, 1990; Friedman, Science 244:1275-1281 , 1989; Eglitis et al , BioTechniques 6:608-614, 1988; Tolstoshev et al , Current Opinion in Biotechnology 1:55-61, 1990; Sharp, Lancet 337: 1277- 1278, 1991 ; Cornetta et al , Nucleic Acid Research and Molecular Biology 36:311-322, 1987; Anderson, Science 226:401-409, 1984; Moen, Blood Cells 17:407-416, 1991 ; Miller et al , Biotechnology 7:980-990, 1989; Le Gal La Salle et al , Science 259:988-990, 1993; and Johnson, Chest 107:77S-83S
- Retroviral vectors are particularly well developed and have been used in clinical settings (Rosenberg et al, N. Engl. J. Med 323:370, 1990; Anderson et al , US5,399,346).
- Non- viral approaches can also be employed for the introduction of an miRNA therapeutic to a cell of a subject.
- an miRNA can be introduced into a cell by administering the nucleic acid in the presence of lipofection (Feigner et al, Proc. Natl. Acad. Sci. U.S.A. 84:7413, 1987; Ono et al, Neuroscience Letters 17:259, 1990; Brigham et al , Am. J. Med. Sci.
- microRNA molecules are administered in combination with a liposome and protamine.
- Gene transfer can also be achieved using non-viral means involving transfection in vitro. Such methods include the use of calcium phosphate, DEAE dextran, electroporation, and protoplast fusion. Liposomes can also be potentially beneficial for delivery of DNA into a cell.
- Micro RNA expression for use in polynucleotide therapy methods can be directed from any suitable promoter ⁇ e.g. , the human cytomegalovirus (CMV), simian virus 40 (SV40), or metallothionein promoters), and regulated by an appropriate mammalian regulatory element. For example, if desired, enhancers known to preferentially direct gene expression in specific cell types can be used to direct the expression of a nucleic acid.
- CMV human cytomegalovirus
- SV40 simian virus 40
- metallothionein promoters metallothionein promoters
- enhancers known to preferentially direct gene expression in specific cell types can be used to direct the expression of a nucle
- the enhancers used can include, without limitation, those that are characterized as tissue- or cell- specific enhancers.
- the specific dosage regimes should be adjusted over time according to the individual need and the professional judgment of the person administering or supervising the administration of the compositions.
- compositions that increase the expression of a microRNAs described herein for treatment.
- pharmaceutical compositions comprising an agent that enhances the expression of an miRNA described here.
- Polynucleotides described here may be administered as part of a pharmaceutical composition.
- the composition is preferably sterile and contains a therapeutically effective amount of a polynucleotide molecule in a unit of weight or volume suitable for administration to a subject.
- the therapeutic polynucleotide molecule described here may be administered with a pharmaceutically-acceptable carrier, in unit dosage form.
- a pharmaceutically-acceptable carrier in unit dosage form.
- Conventional pharmaceutical practice may be employed to provide suitable formulations or compositions to administer the compounds to patients.
- Carrier as used herein includes pharmaceutically acceptable carriers, excipients, or stabilizers which are nontoxic to the cell or mammal being exposed thereto at the dosages and concentrations employed. Often the physiologically acceptable carrier is an aqueous pH buffered solution.
- physiologically acceptable carriers include buffers such as phosphate, citrate and other organic acids; antioxidants including ascorbic acid; low molecular weight (less than about 10 residues) polypeptide; proteins, such as serum albumin, gelatin, or immunoglobulins; hydrophilic polymers such as polyvinylpyrrolidone; amino acids such as glycine, glutamine, asparagine, arginine or lysine; monosaccharides, disaccharides, and other carbohydrates including glucose, mannose, or dextrins; chelating agents such as EDTA; sugar alcohols such as mannitol or sorbitol; salt forming counterions such as sodium; and/or nonionic surfactants such as TWEEN, polyethylene glycol (PEG), and PLURONICS.
- buffers such as phosphate, citrate and other organic acids
- antioxidants including ascorbic acid
- proteins such as serum albumin, gelatin, or
- the active ingredients may also be entrapped in microcapsules prepared, for example, by interfacial polymerization, for example, hydroxymethylcellulose or gelatin-microcapsules and poly(methylmethacylate) microcapsules, respectively, in colloidal drug delivery systems (for example, liposomes, albumin microspheres, microemulsions, nano-particles, and nanocapsules) or in macroemulsions.
- colloidal drug delivery systems for example, liposomes, albumin microspheres, microemulsions, nano-particles, and nanocapsules
- macroemulsions for example, liposomes, albumin microspheres, microemulsions, nano-particles, and nanocapsules
- the formulations to be used for in vivo administration must be sterile. This is readily accomplished by filtration through sterile filtration membranes. Sustained-release preparations may be prepared.
- sustained-release preparations include semipermeable matrices of solid hydrophobic polymers containing the antibody, which matrices are in the form of shaped articles, e.g., films, or microcapsules.
- sustained-release matrices include polyesters, hydrogels (for example, poly(2-hydroxyethyl-methacrylate), or poly(vinylalcohol)), polylactides (US3,773,919), copolymers of L-glutamic acid and ⁇ -ethyl-L-glutamate, non-degradable ethylene-vinyl acetate, degradable lactic acid-glycolic acid copolymers such as the LUPRON DEPOT (injectable microspheres composed of lactic acid-glycolic acid copolymer and leuprolide acetate), and poly-D-(-)-3-hydroxybutyric acid. While polymers such as ethylene- vinyl acetate and lactic acid-glycolic acid enable release of molecules for
- compositions described here may be administered in combination with one or more other prophylactic or therapeutic agents, including, for example, but not limited to cytotoxic agents, chemotherapeutic agents, cytokines, growth inhibitory agents, anti- hormonal agents, kinase inhibitors, anti-angiogenic agents, cardioprotectants, immunostimulatory agents, immunosuppressive agents, agents that promote proliferation of hematological cells, angiogenesis inhibitors, protein tyrosine kinase (PTK) inhibitors, additional antibodies, or other therapeutic agents.
- the compositions of the invention are administered in conjunction with radiotherapy, chemotherapy, photodynamic therapy, surgery or other immunotherapy, to a patient who has a hyperproliferative disorder, such as cancer or a tumor.
- Administration may begin before the patient is symptomatic. Any appropriate route of administration may be employed, for example, administration may be parenteral, intravenous, intraarterial, subcutaneous, intratumoral, intramuscular, intracranial, intraorbital, ophthalmic, intraventricular, intrahepatic, intracapsular, intrathecal, intracisternal, intraperitoneal, intranasal, aerosol, suppository, or oral administration.
- therapeutic formulations may be in the form of liquid solutions or suspensions; for oral administration, formulations may be in the form of tablets or capsules; and for intranasal formulations, in the form of powders, nasal drops, or aerosols.
- compositions described here are administered systemically.
- the systemic administration includes parenteral administration, e.g. , intravenous, intradermal, subcutaneous, oral (e.g., inhalation), transdermal (topical), transmucosal, and rectal administration.
- parenteral administration e.g. , intravenous, intradermal, subcutaneous, oral (e.g., inhalation), transdermal (topical), transmucosal, and rectal administration.
- Dosage unit form refers to physically discrete units suited as unitary dosages for the subject to be treated, each unit containing a predetermined quantity of an active compound calculated to produce the desired therapeutic effect in association with the required pharmaceutical carrier.
- Formulations for parenteral administration may, for example, contain excipients, sterile water, or saline, polyalkylene glycols such as polyethylene glycol, oils of vegetable origin, or hydrogenated napthalenes.
- Biocompatible, biodegradable lactide polymer, lactide/glycolide copolymer, or polyoxyethylene- polyoxypropylene copolymers may be used to control the release of the compounds.
- parenteral delivery systems for inhibitory nucleic acid molecules include ethylene- vinyl acetate copolymer particles, osmotic pumps, implantable infusion systems, and liposomes.
- Formulations for inhalation may contain excipients, for example, lactose, or may be aqueous solutions containing, for example, polyoxyethylene-9-lauryl ether, glycocholate and deoxycholate, or may be oily solutions for administration in the form of nasal drops, or as a gel.
- the dosage to treat a subject may depend on the choice of the route of administration, the nature of the formulation, the nature of the subject's illness, the subject's size, weight, surface area, age, and sex, other drugs being administered, and the judgment of the attending physician.
- kits comprising: an isolated nucleic acid comprising a microRNA (miR) 302-367 cluster or a miR 302-367 cluster mimic and instructions.
- the kits may include a histone deacetylase (HDAC) inhibitor.
- HDAC histone deacetylase
- the term "about,” as used herein, may refer to quantitative terms plus or minus 5%, or plus or minus 10%, or plus or minus 15%, or plus or minus 20%.
- subject refers to a mammal including a human in need of therapy for, or susceptible to, a condition or its sequelae.
- the subject may include dogs, cats, pigs, cows, sheep, goats, horses, rats, and mice and humans.
- subject does not exclude an individual that is normal in all respects.
- a subject to be treated may be identified in the judgment of the subject or a health care professional, which can be subjective or objective.
- treatment may refer to administration of a substance to a subject with the purpose to cure, alleviate, relieve, remedy, prevent, suppress, inhibit, or ameliorate a disorder, symptoms of the disorder, a disease state secondary to the disorder, or predisposition toward the disorder.
- Treating may refer to therapeutic treatment or prophylactic or preventative measures, wherein the object is to prevent or lessen the targeted pathologic condition or disorder as described hereinabove, or “treating” may refer only to therapeutic treatment.
- “treating” may include directly affecting or curing, suppressing, inhibiting, preventing, reducing the severity of, delaying the onset of, reducing symptoms associated with the disease, disorder or condition, or a combination thereof.
- treating refers inter alia to delaying progression, expediting remission, inducing remission, augmenting remission, speeding recovery, increasing efficacy of or decreasing resistance to alternative therapeutics, or a combination thereof.
- preventing refers, inter alia, to delaying the onset of symptoms, preventing relapse to a disease, decreasing the number or frequency of relapse episodes, increasing latency between symptomatic episodes, or a combination thereof.
- pressing refers inter alia to reducing the severity of symptoms, reducing the severity of an acute episode, reducing the number of symptoms, reducing the incidence of disease-related symptoms, reducing the latency of symptoms, ameliorating symptoms, reducing secondary symptoms, prolonging patient survival, or a combination thereof.
- the terms "effective amount,” as used herein, refers to an amount of a compound that is capable of producing a medically desirable result in a treated subject.
- the medically desirable result may be objective (i.e., measurable by some test or marker) or subjective (i.e., subject gives an indication of or feels an effect).
- the mammalian heart has limited capacity to regenerate after injury in part due to ineffective reactivation of cardiomyocyte proliferation. While evidence exists for a low level of cardiomyocyte proliferation in the adult heart, it remains unclear whether increasing this rate could be used to therapeutically promote cardiac regeneration.
- the microRNA cluster miR302-367 is shown to be important for cardiomyocyte proliferation during development and is sufficient to induce cardiomyocyte proliferation in the adult and promote cardiac regeneration. Loss of miR302- 367 leads to decreased cardiomyocyte proliferation during development. In contrast, increased miR302-367 expression leads to a profound increase in cardiomyocyte proliferation, in part through repression of the Hippo signal transduction pathway.
- miR302-367 Postnatal expression of miR302-367 leads to reactivation of the cell cycle in cardiomyocytes resulting in reduced scar formation after infarction. However, long-term expression of miR302-367 leads to cardiomyocyte de-differentiation and dysfunction, suggesting that persistent reactivation of the cell cycle in postnatal cardiomyocytes is not desirable. Importantly, this limitation can be overcome by transient systemic application of miR302-367 mimics, leading to increased cardiomyocyte proliferation and mass, decreased fibrosis, and improved function after injury. Our data demonstrate the ability of microRNA based therapeutic approaches to promote cardiac repair and regeneration through the transient activation of cardiomyocyte proliferation.
- the miR302-367flox/flox allele was generated by flanking all five of the miRNAs in this cluster with loxP sites using standard homologous recombination in ES cells.
- the R26R- miR302-367Tg/+ allele was generated using previously described vectors to insert a DNA sequence containing all five members of the miR302-367 cluster into the CAG-R26R locus using standard homologous recombination in ES cells. Genotyping primers for these two new alleles are listed in Table 5. Generation and genotyping of the Nkx2.5cre and Myh6mercremer lines has been described previously. Mice were kept on a mixed C57BL/6:129SVJ background. All animal procedures were performed in accordance with the Institutional Animal Care and Use Committee at the University of Pennsylvania.
- Tissues were fixed in 4% paraformaldehyde, embedded in paraffin, and sectioned at 6- ⁇ intervals. Immunohistochemical staining and other histological procedures were performed using previously described protocols. Primary antibodies were: MF20 (1:20; Hybridoma Bank-University of Iowa), Ki67 (1:50; Abeam, abl6667), a-actinin (1: 100; Sigma, A7811), Phospho-Histone H3 (PH3, 1 :200; Cell Signaling Technology; 9706L), phospho-Yap (1 :200; Cell Signaling Technology, 4911), Yap (1: 100; Cell Signaling Technology, 4912S), cardiac Troponin T (cTnT, 1:100; Thermo Scientific, MS-295-P1), Troponin T-C (Tnnt2, 1:100; Santa Cruz Biotechnology, sc-8121), AuB (1:100; Abeam, ab2254), BrdU (1:50; Hybridoma Bank at University of Iowa).
- Primary antibodies were
- Neonatal mouse cardiomyocytes were prepared by the Cardiac Myocyte Core Laboratory at the University of Pennsylvania. Briefly, mouse cardiomyocytes were isolated by enzymatic disassociation of 1 -day-old neonate hearts (PI). Cells were plated differentially for 2 hours to remove fibroblasts. Cardiomyocytes were plated on laminin-coated glass coverslips (10 mg/cm 2 ) in 12-well plates at 2.5 x 10 5 cells per well.
- HEK 293T cells Human embryonic kidney (HEK) 293T cells (American Type Culture Collection) were cultured on 100-mm plates at 70% confluence. Lentiviral vectors were packaged in 293T cells using X-tremeGENE9 (Roche) to deliver 5 mg of the lentiviral plasmid, 2.5 mg of psPAX2, and 2.5 mg of pMD2.G (Addgene plasmid 12259). Viral supernatant was collected at 48 hours after transfection, concentrated, and applied to cardiomyocytes.
- the ventricles were teased into small pieces with forceps, and sections of ventricular tissue were gently triturated with a Pasteur pipette to dissociate individual myocytes.
- Noncardiomyocytes were depleted by centrifugation.
- Cardiomyocyte suspension was rinsed with phosphate-buffered saline (PBS) and then fixed in intracellular fixation buffer (eBioscience).
- PBS phosphate-buffered saline
- eBioscience intracellular fixation buffer
- FACS analyses of cardiomyocyte purity cells were first permeabilized in lx permeabilization buffer (eBioscience) and then incubated with cardiac troponin T (1: 100; Thermo Scientific, MS-295-P1) for 2 hours at room temperature, followed by incubation with secondary antibody (Alexa Fluor 647, Life Technologies) for 1 hour at room temperature. Samples were analyzed on a BD FACSCanto II (BD Biosciences).
- MI myocardial infarction
- mice (12-15 weeks old, 30-35 gram, and mixed gender) of the indicated genotype and background were used.
- Avertin 200-300 mg/kg, IP
- isoflurane 1-3%)
- the regions of surgical areas neck and chest were shaved and antiseptic agents (betadine and 70% ethanol) were then applied.
- the mouse was fixed in a supine position with tape.
- the tongue was retracted and held with forceps, and a 20-G IV catheter was inserted orally into the trachea.
- the catheter was then attached to a Minivent (type 845, Harvard Apparatus) via the Y-shaped connector. Ventilation was performed with a tidal volume of 0.25-0.35 mL (10 mL/kg) and a respiratory rate of 80-110/min. Pure (100%) oxygen was provided to the inflow of the ventilator.
- a Minivent type 845, Harvard Apparatus
- a thoracotomy was performed by separating the fourth or fifth intercostal space to expose the heart.
- the pericardium was opened and the heart was visualized by gentle retraction on the rib cage.
- An 8-0 silk ligature entering the heart on the left margin of the pulmonary cone and exiting near the insertion of the left auricular appendage was gently tied onto the LAD coronary artery to induce permanent MI.
- the chest and skin incision were closed by layer with 4-0 or 5-0 sutures.
- the mouse was removed from the ventilator at 10-30 minutes post-MI and placed in external warm cages for about 15-45 minutes until full recovery.
- the sham procedure was performed in an identical manner, with the exception that the occluding ligature was not tied.
- Synthetic miR302b/c mimics and miRNA mimic control were formulated with Neutral Lipid Emulsion (NLE, MaxSuppressor in vivo RNALancerll, BIOO Scientific) according to the manufacturer's instructions.
- NLE Neutral Lipid Emulsion
- Adult mice (10 weeks) were given a single dose of 10-mg NLE-formulated miRNA mimics by intravenous tail-vein injection.
- a single dose per day was chosen on the basis of studies showing that the half-life of the mimics in cardiac tissue was between 8 and 24 hours (Fig. 13 A).
- Hearts were perfused with PBS to remove circulating blood and snap-frozen in liquid nitrogen at the indicated time points after miRNA mimic treatment.
- mice were anesthetized with inhalation of isoflurane induction 3%, followed by maintenance at 2% using a nose cone.
- the mouse was placed on a warm platform in the supine position to keep the body temperature around 37°C.
- the chest hair was removed using hair removal gel cream (Nair).
- the limbs are taped onto the metal EKG leads. Echo was performed using VisualSonic Vevo 2100 system with a 40 MHz transducer for cardiac imaging.
- VisualSonic Vevo 2100 system with a 40 MHz transducer for cardiac imaging. In brief, by placing the transducer along the long-axis of LV, and directing to the right side of the neck of the mouse, two-dimensional LV long-axis is obtained. Then the transducer is rotated clockwise by 90 degree, and the LV short-axis view is visualized.
- 2D- guided LV M-mode at the papillary muscle level is recorded from either the short-axis view and/or the long-axis view.
- Trans-mitral inflow Doppler spectra are recorded in an apical 4- chamber view by placing the sample volume at the tip of the mitral valves. Echo images are downloaded and analyzed offline using images analyzing software (Vevo 2100, 1.6, VisualSonic). At least three beats of imaging were measured and averaged for the interpretation of any given measurement. End-diastolic and end-systolic left ventricular internal diameters (LVIDd, LVIDs) were measured from the left ventricular short axis view with 2D orientated M-mode imaging.
- FS fractional shortening
- EF Ejection fraction
- mouse coronary artery was performed by adopting a technique for in vivo filling mouse coronary vessels. Briefly, mouse was euthanized with exsanguination under deep anesthesia, and heart was flushed out of blood with cold saline via inferior vena cava. The main branches of vessels except ascending aorta and pulmonary artery were ligated to prevent leakage. A 26-gauge angiocatheter was introduced into proximal aorta, and heart was perfused with cold saline (1-2 mL), 0.1M KC1 solution (1 mL), then with fixative (2% PFA, 1 mL) for about 2 minutes.
- Proteins were isolated and solubilized after TRIzol extraction of RNA and DNA from cultured cells as previously described. Briefly, neonatal mouse cardiomyocytes were homogenized in TRIzol reagent, followed by the addition of chloroform. The RNA in the upper, aqueous phase was separated with the DNA and proteins in the lower, organic phase. The DNA was precipitated by the addition of ethanol. The protein in the phenol-ethanol supernatant was precipitated with acetone. The protein pellet was then washed with 0.3 M guanidine hydrochloride/95% ethanol and dissolved in 1% SDS at 50°C. Protein concentrations were determined using the BCA Protein Assay Reagent kit (Bio-Rad Laboratories).
- Proteins extracts were analyzed on polyacrylamide gels (10% NuPAGE bis- tris gel, Invitrogen) and transferred onto nitrocellulose membranes (Bio-Rad Laboratories). Rabbit anti-Yap (1 :500; Cell Signaling Technology) and mouse anti-glyceraldehyde-3- phosphate dehydrogenase (1:1000; Sigma) were used as the primary antibodies. The blots were detected with SuperSignal West Pico Chemiluminescent Substrate (Thermo Scientific).
- HITS-CLIP was performed as published using the monoclonal Argonaute antibody 2A8.3 x 10E6 mouse embryonic stem cells were plated and, 48 hours later, cross-linked once with 400 mJ/cm 2 and an additional 200 mJ/cm 2 on ice.
- the Illumina library was sequenced on an Illumina GA-IIx at University of Pennsylvania Functional Genomics Core. Reads were aligned to the mouse genome (mm9), RefSeqs, and pre-miRNA (mirBase 13.0) using ELAND and allowing up to two mismatches. Significant CLIP tag cluster peaks located in the 3'UTR of mRNAs were identified, and potential miRNA regulators were identified as previously described. Luciferase reporter assays
- the firefly luciferase gene was derived from pGL3-basic vector (Promega) and cloned in to pcDNA3.1(-) vector.
- the DNA fragment containing full-length 3' UTR for putative miR-302-367 targets were inserted into pcDNA3.1(-) downstream of the luciferase cDNA.
- NIH-3T3 cells were transfected using Fugene 6 reagent according to the manufacturer's instructions with both the luciferase reporter and an expression plasmid for miR302-367 (pcDNA3.1- miR-302-367).
- miR302-367 cluster is required for cardiomyocyte proliferation during development
- a conditional mouse line was generated to perform miR302-367 gain-of-function experiments in vivo (R26R-miR302-367 Tg + )(Fig. 9, A and B). Activating this allele using the Nkx2.5 cre line resulted in high-level expression of all members of the miR302-367 cluster (Fig. 9C) and a marked increase in cardiomyocyte proliferation at E18.5 (Fig. 2A). Nkx2.5 cre :R26R-miR302-367 Tg + mutants died by P28.
- Nkx2.5 cre :R26R-miR302- 367 Tg + mutants exhibited profound cardiac enlargement, or cardiomegaly, accompanied by extensive cardiomyocyte proliferation (Fig. 2B). This is in contrast to control littermates, which did not exhibit noticeable cardiomyocyte proliferation at P20, consistent with previous observations.
- Cardiomyocytes from P17 hearts were isolated and found to have a significant increase in the percentage of mononucleated and binucleated cardiomyocytes and a decrease in the percentage of multinucleated cardiomyocytes (Fig. 9D), suggesting that miR302-367 overexpression affects both cell cycle activity and nucleation of cardiomyocytes when expressed from the beginning of cardiac development.
- heart weight-to-tibia length ratios were significantly higher for Nkx2.5 cre :R26R-miR302-367 Tg + mutants at P20 (Fig.
- miR302-367 overexpression resulted in down-regulation of programmed cell death (Fig. 3D).
- miR302-367 overexpression was also observed to result in down- regulation of fatty acid metabolism genes including PparA, PparD, and Acoxl, suggesting cardiomyocyte dysfunction (Fig. 3F).
- Fig. 3F cardiomyocyte dysfunction
- miR302-367 inhibits Hippo pathway to promote cardiomyocyte proliferation
- HITS-CLIP cross-linking immunoprecipitation
- miR-302 targeted sequences in the 3' untranslated region (3'UTR) of Mstl (Stk4), a core component of Hippo signaling kinase cascade (Table 3). Moreover, miRanda predicted that Lats2 and Moblb, essential kinases in the Hippo pathway, were potential targets of miR302.
- the Hippo signal transduction pathway regulates organ size and cell proliferation, and loss of Mstl/2 and Lats kinases in the developing mouse heart causes increased proliferation in cardiomyocytes.
- miR302-367 was hypothesized to regulate cardiomyocyte proliferation through the inhibition of Hippo signaling.
- miR302-367 inhibits Hippo pathway activity through repression of the kinases Mstl, Lats2, and Moblb.
- Yes activated protein is the downstream transcriptional effector of Hippo signaling.
- Phosphorylated Yap phospho-Yap
- Yap is translocated to the nucleus where it binds to members of the TEAD transcription factor family and activates gene expression, including pathways that promote proliferation and survival.
- Overexpression of a transcriptionally active form of Yap (YapS127A) in the mouse heart promotes cardiomyocyte proliferation and cardiac regeneration.
- Myh6 mercremer :R26R-miR302-367 Tg + hearts exhibited ventricular dilation and a reduction in fractional shortening and ejection fraction 3 weeks after injury (Fig. 6E).
- Sustained cardiomyocyte proliferation in the adult heart was hypothesized to be caused by prolonged miR302-367 overexpression compromised cardiac function, possibly by inducing a persistent dedifferentiated and highly proliferative phenotype.
- the expression of genes associated with cardiomyocyte proliferation and differentiation was examined at days 10 and 21 after miR302-367 overexpression.
- miR302b/c mimics or a negative control mimic were administered daily for 7 days by tail-vein injections.
- the expression of miR302-targeted genes related to the Hippo pathway, including Mstl , Lats2,and Moblb, were decreased in the hearts of miR302b/c mimic-treated mice (Fig. 13B).
- Expression of genes associated with cardiomyocyte differentiation and proliferation were examined at an early time point (day 8) and late time point (day 21) after mimic treatment.
- the expression of the proliferation-associated gene Ccndl increased at day 8, but returned to basal levels at day 21 (Fig. 13C).
- the expression of Nppa and the ratio of Myh6 to Myh7 expression were also altered at day 8, but returned to normal levels at day 21 (Fig. 13C).
- mice were treated with miR302b/c mimics or a negative control miRNA mimic, using daily tail- vein injections starting 1 day after MI and continuing daily for 7 days.
- the expression of the Hippo signaling components Mstl and Moblb was significantly decreased in miR302b/c mimic-treated hearts after MI compared to the controls (Fig. 13D).
- Forty-eight hours after the final treatment increased cardiomyocyte proliferation and decreased apoptosis was observed in the hearts of miR302b/c mimic-treated mice (Fig. 13E).
- miR302b/c mimic-treated animals showed that they exhibited significantly increased fractional shortening and ejection fraction after injury compared with the control mimic-treated animals but did not reach the ejection fraction and fractional shortening of sham animals (Fig. 7D).
- miR302b/c mimic-treated mice displayed reduced cardiac remodeling, as gauged by end-diastolic volume and end-systolic volume measurements (Fig. 7E).
- miR302b/c mimics increased the density of new blood vessels in the peri-infarct zone but did not affect vascular cell proliferation (Fig. 13, G to I).
- NM_011717 widely-interspaced zinc finger motifs Mus musculus
- NM_008997 RAB11B member RAS oncogene family Mus musculus
- NM_026186 coiled-coil domain containing 49 Mus musculus
- NM_011390 solute carrier family 12 member 7 Mus musculus
- RNA III DNA directed polypeptide G Mus musculus
- NM_172516 dual serine/threonine and tyrosine protein kinase Mus musculus phosphatidylinositol-5-phosphate 4-kinase, type II,
- NM_009723 ATPase Ca++ transporting, plasma membrane 2 Mus musculus
- NM_019535 SH3-domain GRB2-like 2 Mus musculus
- NM_009274 serine/arginine-rich protein specific kinase 2 Mus musculus
- NM_001111099 cyclin-dependent kinase inhibitor 1 A (P21) Mus musculus similar to mKIAA1915 protein; myb-like, SWIRM and
- NM_207682 kinesin family member IB Mus musculus
- NM_001013380 dynein, cytoplasmic 1 light intermediate chain 2 Mus musculus
- NM_021420 serine/threonine kinase 4 Mus musculus
- NM_011358 splicing factor, arginine/serine-rich 2 (SC-35) Mus musculus
- NM_013876 ring finger protein 11 Mus musculus
- the miR302-367 cluster is demonstrated to promote embryonic and postnatal cardiomyocyte proliferation, in part through targeting multiple kinases in the Hippo signal transduction pathway.
- Transient treatment of mice with small- molecule miR302 mimics led to improved cardiac regeneration, increased cardiomyocyte proliferation and survival, and improved vessel formation in the peri-infarct region - all accompanied by decreased fibrosis.
- the reduced fibrotic scarring was likely due to the observed enhancement of myocardial regeneration.
- zebrafish experiments have shown that cardiac injury induces a high level of cardiomyocyte proliferation with a concomitant decrease in fibrotic scarring.
- Additional studies have indicated that cardiomyocytes can inhibit cardiac fibrosis in a paracrine manner. These studies provide a framework to further explore miRNA mimic -based treatments to promote heart repair and regeneration in humans.
- the Hippo pathway regulates proper organ size by regulating cell proliferation, as well as programmed cell death.
- Recent studies have shown that inhibition of Yap phosphorylation through loss of key components in the pathway, such as Salvador/WW45, or expression of a phosphorylation-resistant form of Yap can lead to a profound increase in adult mouse cardiomyocyte proliferation. Cardiac-specific loss of Yap leads to increased myocyte apoptosis and fibrosis.
- miR302-367 targeted multiple components of the Hippo signaling kinase cascade to promote cardiomyocyte proliferation. Furthermore, overexpression of miR302-367 promoted cell proliferation while decreasing programmed cell death, consistent with inhibition of Hippo signaling.
- miR302-367 is expressed at high levels in both the developing mouse heart and lung, as well as in ES cells, where it plays an important role in promoting pluripotency.
- Other miRNAs have also been shown to promote murine cardiomyocyte proliferation, including miR590 and the miR17-92 family.
- miR17-92 is expressed in the developing mouse heart and lung, and can promote a highly proliferative and undifferentiated state in lung epithelium, similar to miR302-367. As such, certain miRNAs can maintain an undifferentiated state by promoting high levels of cell proliferation while inhibiting differentiation.
- miRNA mimic strategies have been shown here to promote cardiac regeneration in vivo in a transient manner that avoids the deleterious effects of persistent cardiomyocyte dedifferentiation.
- This Example advances a new approach where a transient proliferative stimulus to the injured heart using a simple methodology based on miRNA and miRNA mimics.
- This approach has distinct advantages over cellular therapy because it does not require engraftment of exogenous cells, which has been a significant hurdle in the field of cardiac regeneration.
- this approach overcomes the potential for persistent cardiomyocyte dedifferentiation owing to its transient nature, which should lead to preserved cardiomyocyte function after ischemic injury.
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